First Measurement of Polarized Spin-Density Matrix Elements and Differential Cross Sections dσ/dt in ω Photoproduction off the Proton for 2.7

Authors

• T. Hu, Florida State University
• Z. Akbar, Florida State University
• V. Crede, Florida State University
• J. M. Laget, Thomas Jefferson National Accelerator Facility
• V. Mathieu, Universidad Complutense de Madrid and IPARCOS
• M. J. Amaryan, Old Dominion UniversityFollow
• W. R. Armstrong, Argonne National Laboratory
• H. Atac, Temple University
• N. A. Baltzell, University of South Carolina
• L. Barion, INFN, Sezione di Ferrara
• M. Battaglieri, INFN, Sezione di Genova
• I. Bedlinskiy, National Research Centre Kurchatov Institute- ITEP
• B. Benkel, Universidad Técnica Federico Santa María
• F. Benmokhtar, Duquesne University
• A. Bianconi, INFN, Sezione di Pavia
• L. Biondo, INFN, Sezione di Genova
• A. Biselli, Fairfield University
• M. Bondi, INFN, Sezione di Genova
• F. Bossu, IRFU, CEA, Université Paris-Saclay
• S. Boiarinov, Thomas Jefferson National Accelerator Facility
• W. J. Briscoe, The George Washington University
• S. Bueltmann, Old Dominion UniversityFollow
• D. Bulumulla, Old Dominion UniversityFollow
• V. D. Burkert, Thomas Jefferson National Accelerator Facility
• R. Capobianco, University of Connecticut
• D. S. Carman, Thomas Jefferson National Accelerator Facility
• J. C. Carvajal, Florida International University
• A. Celentano, INFN, Sezione di Genova
• T. Chetry, Mississippi State University
• G. Ciullo, Università di Ferrarra
• G. Clash, University of York
• P. L. Cole, Lamar University
• M. Contalbrigo, INFN, Sezione di Ferrara
• G. Costantini, INFN, Sezione di Pavia
• A. D'Angelo, INFN, Sezione di Roma Tor Vergata
• N. Dashyan, Yerevan Physics Institute
• R. De Vita, INFN Sezione di Genova
• M. Defurne, IRFU, CEA, Université Paris-Saclay
• A. Deur, Thomas Jefferson National Accelerator Facility
• S. Diehl, University of Connecticut
• C. Djalali, Ohio University
• R. Dupre, IRFU, CEA, Université Paris-Saclay
• H. Egiyan, University of New Hampshire
• A. El Alaoui, INFN, Sezione di Ferrara
• L. El Fassi, Argonne National Laboratory
• L. Elouadrhiri, Thomas Jefferson National Accelerator Facility
• P. Eugenio, Florida State University
• S. Fegan, University of York
• A. Filippi, INFN, Sezione di Torino
• G. Gavalian, Old Dominion University
• Y. Ghandilyan, Yerevan Physics Institute
• G. P. Gilfoyle, University of Richmond
• F. X. Girod, Thomas Jefferson National Accelerator Facility
• A. A. Golubenko, Lomonosov Moscow State University
• G. Gosta, INFN, Sezione di Pavia
• R. W. Gothe, University of South Carolina
• K. A. Griffioen, College of William & Mary
• M. Guidal, IRFU, CEA, Université Paris-Saclay
• K. Hafidi, Argonne National Laboratory
• H. Hakobyan, Universidad Técnica Federico Santa María
• M. Hattawy, Old Dominion UniversityFollow
• T. B. Hayward, University of Connecticut - Storrs
• D. Heddle, Christopher Newport University
• A. Hobart, Université Paris-Saclay, CNRS/IN2P3
• M. Holtrop, University of New Hampshire
• Y. Ilieva, The George Washington University
• D. G. Ireland, University of Glasgow
• E. L. Isupov, Lomonosov Moscow State University
• D. Jenkins, Virginia Tech
• H. S. Jo, Kyungpook National University
• K. Joo, University of Connecticut - Storrs
• S. Joosten, Argonne National Laboratory
• D. Keller, University of Virginia
• A. Khanal, Florida International University
• M. Khandaker, Norfolk State University
• A. Kim, University of Connecticut - Storrs
• W. Kim, Kyungpook National University
• F. J. Klein, Catholic University of America
• V. Klimenko, University of Connecticut
• A. Kripko, Il Physikalisches Institut der Universität Gieβen
• V. Kubarovsky, Rensselaer Polytechnic Institute
• V. Lagerquist, Old Dominion University
• L. Lanza, INFN, Sezione di Roma Tor Vergata
• M. Leali, INFN, Sezione di Pavia
• P. Lenisa, Università di Ferrara
• K. Livingston, University of Glasgow
• I.J.D. MacGregor, University of Glasgow
• D. Marchand, Université Paris-Saclay
• L. Marsicano, INFN, Sezione di Genova
• V. Mascagna, INFN, Sezione di Pavia
• M. E. McCracken, Carnegie Mellon University
• B. McKinnon, University of Glasgow
• Z. E. Meziani, Argonne National Laboratory
• S. Migliorati, INFN, Sezione di Pavia
• R. G. Milner, Massachusetts Institute of Technology
• T. Mineeva, University of Connecticut - Storrs
• M. Mirazita, INFN, Laboratori Nazionali di Frascati
• V. Mokeev, Thomas Jefferson National Accelerator Facility
• C. Munoz Camacho, Université Paris-Saclay
• P. Nadel-Turonski, Thomas Jefferson National Accelerator Facility
• K. Neupane, University of South Carolina - Columbia
• J. Newton, Thomas Jefferson National Accelerator Facility
• S. Niccoai, Université Paris-Saclay
• M. Nicol, University of York
• G. Niculescu, James Madison University
• M. Osipenko, INFN, Sezione di Genova
• A. I. Ostrovidov, Florida State University
• P. Pandey, Old Dominion UniversityFollow
• M. Paolone, New Mexico State University
• L. L. Pappalardo, Università di Ferrara
• R. Paremuzyan, Thomas Jefferson National Accelerator Facility
• E. Pasyuk, Thomas Jefferson National Accelerator Facility
• S. J. Paul, University of California Riverside
• W. Phelps, Christopher Newport University
• N. Pilleux, Argonne National Laboratory
• O. Pogorelko, National Research Centre Kurchatov Institute- ITEP, Moscow
• J. W. Price, California State University
• Y. Prok, Old Dominion UniversityFollow
• B. A. Raue, Florida International University
• T. Reed, Florida International University
• M. Ripani, INFN, Sezione di Genova
• J. Ritman, GSI Helmholtzzentrum für Schwerionenforschung GmbH
• A. Rizzo, INFN, Sezione di Roma Tor Vergata
• G. Rosner, University of Glasgow
• F. Sabatié, IRFU, CEA, Université Paris-Saclay
• C. Salgado, Norfolk State University
• S. Schadmand, GSI Helmholtzzentrum für Schwerionenforschung GmbH
• A. Schmidt, The George Washington University
• R. A. Schumacher, Carnegie Mellon University
• E. V. Shirokov, Lomonosov Moscow State University
• U. Shrestha, University of Connecticut
• P. Simmerling, University of Connecticut
• D. Sokhan, IRFU, CEA, Université Paris-Saclay
• N. Sparveris, Temple University
• S. Stepanyan, Thomas Jefferson National Accelerator Facility
• I. I. Strakovsky, The George Washington University
• S. Strauch, University of South Carolina - Columbia
• R. Tyson, University of Glasgow
• M. Ungaro, University of Connecticut
• L. Venturelli, INFN, Sezione di Pavia
• H. Voskanyan, Yerevan Physics Institute
• A. Vossen, Thomas Jefferson National Accelerator Facility
• E. Voutier, Université Paris-Saclay, CNRS/IN2P3
• D. P. Watts, University of York
• X. Wei, Thomas Jefferson National Accelerator Facility
• M. H. Wood, University of South Carolina - Columbia
• B. Yale, College of William & Mary
• M. Yurov, Kyungpook National University
• N. Zachariou, University of York
• J. Zhang, Old Dominion University
• The CLAS Collaboration at Jefferson Laboratory

Document Type

Article

Publication Date

2026

DOI

10.1016/j.physletb.2026.140845

Publication Title

Physics Letters B

Volume

880

Pages

140845

Abstract

We report on the differential cross sections dσ/dt, the unpolarized spin-density matrix elements ρ⁰₀₀, ρ⁰₁₋₁, Re ρ⁰₁₀, and the first extraction of the polarized elements Im ρ³₁₀, Im ρ³₁₋₁ for the reaction γp → pω using the CLAS spectrometer at Jefferson Laboratory. The ω mesons were detected in their dominant charged decay mode, ω→π+π−π⁰, and all t-dependent results are presented in a fine binning for incident photon energies between 2.73 and 5.16 GeV (corresponding to the center-of-mass energy range W ∈ [ 2.45, 3.25 ] GeV). All matrix elements are first measurements for −t>0.6 GeV². Moreover, differential cross sections dσ/d(cos Θ^ω_c.m.) and the corresponding angle-dependent unpolarized spin-density matrix elements in the Adair frame are presented for the incident photon energy range 1.56–3.80 GeV (corresponding to W ∈ [ 1.95, 2.83 ] GeV). These new ω photoproduction data are consistent with earlier CLAS results but extend the energy range well beyond the nucleon resonance region into the Regge regime. The comparison with Regge-theory-based model predictions shows that the new data impose more stringent constraints on our understanding of ω photoproduction.

Rights

© 2026 The Authors.

This is an open access article under the Creative Commons Attribution 4.0 International (CC BY 4.0) License.

Data Availability

Article states: "Data will be made available on request."

Original Publication Citation

Hu, T., Akbar, Z., Crede, V., Laget, J. M., Mathieu, V., Amaryan, M. J., Armstrong, W. R., Atac, H., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Benkel, B., Benmokhtar, F., Bianconi, A., Biondo, L., Biselli, A., Bondi, M., Bossù, F.,…Jefferson, L. (2026). First measurement of polarized spin-density matrix elements and differential cross sections dσ/dt in ω photoproduction off the proton for 2.7 < Eγ <5.2 GeV using CLAS at Jefferson Lab. Physics Letters B, 880, Article 140845. https://doi.org/10.1016/j.physletb.2026.140845 

ORCID

0000-0002-5648-0256 (Amaryan), 0000-0002-6738-5457 (Gavalian)

Repository Citation

Hu, T.; Akbar, Z.; Crede, V.; Laget, J. M.; Mathieu, V.; Amaryan, M. J.; Armstrong, W. R.; Atac, H.; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benkel, B.; Benmokhtar, F.; Bianconi, A.; Biondo, L.; Biselli, A.; Bondi, M.; Bossu, F.; Boiarinov, S.; Briscoe, W. J.; Bueltmann, S.; Bulumulla, D.; Burkert, V. D.; Capobianco, R.; Carman, D. S.; Carvajal, J. C.; Celentano, A.; Chetry, T.; Ciullo, G.; Clash, G.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Deur, A.; Diehl, S.; Djalali, C.; Dupre, R.; Egiyan, H.; El Alaoui, A.; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fegan, S.; Filippi, A.; Gavalian, G.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Golubenko, A. A.; Gosta, G.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hayward, T. B.; Heddle, D.; Hobart, A.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Isupov, E. L.; Jenkins, D.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khanal, A.; Khandaker, M.; Kim, A.; Kim, W.; Klein, F. J.; Klimenko, V.; Kripko, A.; Kubarovsky, V.; Lagerquist, V.; Lanza, L.; Leali, M.; Lenisa, P.; Livingston, K.; MacGregor, I.J.D.; Marchand, D.; Marsicano, L.; Mascagna, V.; McCracken, M. E.; McKinnon, B.; Meziani, Z. E.; Migliorati, S.; Milner, R. G.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Munoz Camacho, C.; Nadel-Turonski, P.; Neupane, K.; Newton, J.; Niccoai, S.; Nicol, M.; Niculescu, G.; Osipenko, M.; Ostrovidov, A. I.; Pandey, P.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Paul, S. J.; Phelps, W.; Pilleux, N.; Pogorelko, O.; Price, J. W.; Prok, Y.; Raue, B. A.; Reed, T.; Ripani, M.; Ritman, J.; Rizzo, A.; Rosner, G.; Sabatié, F.; Salgado, C.; Schadmand, S.; Schmidt, A.; Schumacher, R. A.; Shirokov, E. V.; Shrestha, U.; Simmerling, P.; Sokhan, D.; Sparveris, N.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Tyson, R.; Ungaro, M.; Venturelli, L.; Voskanyan, H.; Vossen, A.; Voutier, E.; Watts, D. P.; Wei, X.; Wood, M. H.; Yale, B.; Yurov, M.; Zachariou, N.; Zhang, J.; and The CLAS Collaboration at Jefferson Laboratory, "First Measurement of Polarized Spin-Density Matrix Elements and Differential Cross Sections dσ/dt in ω Photoproduction off the Proton for 2.7 " (2026). Physics Faculty Publications. 1073.
https://digitalcommons.odu.edu/physics_fac_pubs/1073